the technology is there. it's pretty open technology, it's easy to replicate. the question of what anchors its value, many people say it's the first mover advantage, but i can give you the passwords of 21st movers that i subscribe to that no longer exist. it's a fragile type of equilibrium that bitcoin has. >> steven, thanks for that, steven englander staying with us today. >>> still to come on this show, christie's auction house says a guitar used by bob dylan in 1965 could seld fl for $500,000. tune in after the break to find out more about that. 0 that's a good thing, but it doesn't cover everything. only about 80% of your part b medical expenses. the rest is up to you. so consider an aarp medicare supplement insurance plan, insured by unitedhealthcare insurance company. like all standardized medicare supplement insurance plans, they could save you in out-of-pocket medical costs. call today to request a free decision guide. with these types of plans, you'll be able to visit any doctor or hospital that accepts medicare patients... plus, there are no networks,